# GPT-OSS 120B

GPT-OSS 120B is a model from OpenAI with open weights, first recorded on 17 Sep 2026; its release date is not established. The context window is 131,072 tokens. The maximum output is 131,072 tokens.

- Developer: OpenAI
- Id: gpt-oss-120b
- Sighting: 2026-09-17T00:52:24.374Z
  - [evidence link](https://models.dev/#gpt-oss-120b)
- Status: Released
- Open weights: 2025-08-05
  - [evidence link](https://openai.com/index/introducing-gpt-oss)
  - [evidence link](https://help.openai.com/en/articles/9624314-model-release-notes)
  - [evidence link](https://openai.com/index/introducing-gpt-oss)
- Canonical: https://alexgetman.com/models/openai/gpt-oss-120b/

## Questions

### What is the context window of GPT-OSS 120B?

The context window is 131,072 tokens. The maximum output is 131,072 tokens.

### Are the weights of GPT-OSS 120B publicly available?

Yes. OpenAI publishes the weights.

### When was GPT-OSS 120B released?

Its release date is not established. Signal Forge first recorded it on 17 Sep 2026.

## Evidence links

- [Artificial Analysis · benchmarks](https://artificialanalysis.ai/models)
- [review](https://developers.openai.com/api/docs/models/gpt-oss-120b)
- [openai-model-release-notes](https://help.openai.com/en/articles/9624314-model-release-notes)
- [Hugging Face · inference providers](https://huggingface.co/openai/gpt-oss-120b)
- [Azure Foundry · lifecycle](https://learn.microsoft.com/en-us/azure/foundry/concepts/model-lifecycle-retirement?view=azureml-api-2)
- [models.dev · catalogue](https://models.dev/#databricks-gpt-oss-120b)
- [models-dev](https://models.dev/#gpt-oss-120b)
- [models.dev · catalogue](https://models.dev/#gpt-oss-120b-1:0)
- [models.dev · catalogue](https://models.dev/#gpt-oss-120b-maas)
- [models.dev · catalogue](https://models.dev/#gpt-oss:120b)
- [openai-articles](https://openai.com/index/introducing-gpt-oss)
- [Arena · leaderboards](https://openai.com/index/introducing-gpt-oss/)
- [OpenCode · discovery](https://opencode.ai/data/openai/gpt-oss-120b)
- [OpenRouter](https://openrouter.ai/openai/gpt-oss-120b)
- [OpenRouter](https://openrouter.ai/openai/gpt-oss-120b:batch)
- [OpenRouter · usage](https://openrouter.ai/rankings)

## Signals

- [Kimi K3](https://alexgetman.com/signals/2026/09/18/kimi-k3-2/)
- [GPT-OSS 120B spotted on Arena](https://alexgetman.com/signals/2026/09/11/gpt-oss-120b-high/)